Two new burrowing mud shrimps of the genus <i>Gilvossius</i> from the Gulf of Mexico (Crustacea: Decapoda: Callianassidae)

Previous reports of Gilvossius setimanus (De Kay, 1844) from the Gulf of Mexico have been based on a population of small specimens from deep offshore continental shelf waters off Texas and larger specimens from shorelines and shallow embayments of western Florida. The offshore population, herein designated Gilvossius fredericqae n. sp., reaches sexual maturity at much smaller size than does Gilvossius setimanus s.s. from the U.S. Atlantic seaboard, a species from which it differs in a number of morphological characters. While maturing at a similar size to G. setimanus s.s., a western Florida population, herein designated Gilvossius howellorum n. sp., differs from it in the 16S mt gene sequence, and from both it and the offshore species in morphology. An updated synonymy and rediagnosis of G. setimanus s.s. herein accompany descriptions of the two new species.

Keywords:
Ghost shrimp; infauna; western Atlantic; Gulf of Mexico; systematics

Authorship

Darryl L. Felder

Department of Biology, Laboratory for Crustacean Research, University of Louisiana at Lafayette. Lafayette, Louisiana USA 70504-3602University of Louisiana at LafayetteUSALafayette, Louisiana, USA Department of Biology, Laboratory for Crustacean Research, University of Louisiana at Lafayette. Lafayette, Louisiana USA 70504-3602

http://orcid.org/0000-0001-7679-7712

Rafael Robles

Facultad de Ciencias Químico Biológicas, Universidad Autónoma de Campeche, Campus V. Predio s/n por Avenida Ing. Humberto Lanz Cárdenas y Fracc. Ecológico Ambiental Siglo XXIII, Colonia Ex Hacienda Kalá, San Francisco de Campeche, Campeche, México 24085 Universidad Autónoma de CampecheMéxicoSan Francisco de Campeche, Campeche, México Facultad de Ciencias Químico Biológicas, Universidad Autónoma de Campeche, Campus V. Predio s/n por Avenida Ing. Humberto Lanz Cárdenas y Fracc. Ecológico Ambiental Siglo XXIII, Colonia Ex Hacienda Kalá, San Francisco de Campeche, Campeche, México 24085

http://orcid.org/0000-0003-0531-5557

Corresponding author:
Rafael Robles roblesrafaelr@gmail.com

DLF
E-mail: dlf4517@louisiana.edu

RR
E-mail: roblesrafaelr@gmail.com

SCIMAGO INSTITUTIONS RANKINGS

Figures

Figures (6)

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Figure 1.
Gilvossius setimanus s.s., adapted from Williams (1984Williams, A.B. 1984. Shrimps, lobsters, and crabs of the Atlantic coast of the eastern United States, Maine to Florida. Washington, D.C., Smithsonian Institution Press, 550p.: fig. 1 2 5a-d), male, USNM 14096 (A, C, E, F) and from Rabalais et al. (1981Rabalais, N.N.; Holt, S.A. and Flint, R.W. 1981. Mud shrimps (Crustacea, Decapoda, Thalassinidea) of the northwestern Gulf of Mexico. Bulletin of Marine Science, 31: 96-115.: fig. 2b, c) female, USNM 51007 (B, D). A, anterior carapace, eyes, antennules, and antennae, dorsal surfaces; B, third maxilliped, internal surface; C, D, major cheliped, external surface; E, minor cheliped, external surface; F, sixth pleonal somite, telson, and left uropods, dorsal surfaces. Not shown to scale.

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Figure 2.
Gilvossius howellorum n. sp., male holotype, pocl 12.4 mm, lower Tampa Bay, St. Petersburg, Florida, shallow subtidal flat (USNM 1546234 = ULLZ 12183): A, B, anterior carapace, eyes, and peduncles, lateral and dorsal; C, right mandible, internal; D, right first maxilla, external; E, right second maxilla, external; F, right first maxilliped, external; G, right second maxilliped, internal; H, right third maxilliped without setae, external; I, right third maxilliped, internal. Scale bars = 3.0 mm (A, B, D-I), 1.5 mm (C).

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Figure 3.
Gilvossius howellorum n. sp. A, E, J-L, ovigerous female paratype, pocl 11.5 mm, lower Tampa Bay, St. Petersburg, Florida, shallow subtidal flat (USNM 1540396 = ULLZ 4500TB-A); B-D, F-I, M, male holotype, pocl 12.4 mm, lower Tampa Bay, St. Petersburg, Florida, shallow subtidal flat (USNM 1546234 = ULLZ 12183). A, female major cheliped, external; B, male major chela, external; C, minor cheliped; D, right second pereopod, external; E, left third pereopod, internal; F, right third pereopod, external; G, left fourth pereopod, internal; H, right fifth pereopod, external; I, right fifth pereopod terminus, internal; J, female right first pleopod, external; K, female right second pleopod, external; L, right third pleopod, anterior; M, telson and uropods, dorsal, right uropodal setation shown. Scale bars = 3.0 mm (A-H, J-M), 1.5 mm (I).

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Figure 4.
Gilvossius fredericqae n. sp., female holotype, pocl 4.0 mm, northwestern Gulf of Mexico, off Texas, 98 m depth (USNM 1607374 = ULLZ 17894): A, B anterior carapace, eyes, and peduncles, lateral and dorsal; C, right mandible, internal; D, right first maxilla, external; E, right second maxilla without setae, external; F, right first maxilliped without setae, external; G, right second maxilliped, external; H, I, right third maxilliped, internal and external. Scale bars = 1.0 mm (A, B, E-G), 0.5 mm (C, D).

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Figure 5.
Gilvossius fredericqae n. sp. A, B, E-G, K, L, N, O, female holotype, pocl 4.0 mm, northwestern Gulf of Mexico, off Texas, 98 m depth (USNM 1607374 = ULLZ 17894); C, H-J, ovigerous female paratype, pocl 3.6 mm, northwestern Gulf of Mexico, off Texas, 131 m depth (USNM 1607376 = ULLZ 17903); D, juvenile male paratype, pocl 2.2 mm, northwestern Gulf of Mexico, off Texas, 125 m depth (USNM 1607379 = ULLZ 17906); M, male paratype, pocl 2.7 mm, northwestern Gulf of Mexico, off Texas, 106 m depth (USNM 1607375 = ULLZ 17495). A, major cheliped of female, right, internal; B, same, external; C, major cheliped of ovigerous female, left internal; D, major cheliped of juvenile male, internal; E, minor cheliped of female, left, external; F, second pereopod, left, external; G, third pereopod, right, external; H, fourth pereopod, right, internal; I, same, without setae, external; J, fifth pereopod, right, external; K, first pleopod, female, right, external; L, second pleopod, female, right, external; M, first pleopod, male, right, external; N, third pleopod, right, anterior; O, telson and uropods. Scale bars = 2.0 mm (A-C, E, F-J, O), 1.0 mm (D, K, M, N).

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Figure 6.
Gilvossius setimanus s.s. (A-C), Gilvossius howellorum n. sp. (D-F), Gilvossius fredericqae n. sp. (G). A, male, preserved major cheliped, external above, internal below, prpdl 16.1 mm (USNM 9238), Massachusetts; B, female, preserved major cheliped, external above, internal below, prpdl 16.1 mm (USNM 9238), Massachusetts; C, male, preserved major cheliped, external above, internal below, prpdl 18.6 mm, pocl 15.5 mm (USNM 20869), Rhode Island; D, E, male holotype, pre-preservation specimen in lateral views, pocl 12.4 mm (USNM 1546234 = ULLZ 12183) Tampa Bay, western Florida; F, male paratype, preserved major cheliped, external, prpdl 15.0 mm (USNM uncataloged) Anna Maria Island Causeway, western Florida; G, female holotype, preserved specimen in lateral view, pocl 4.0 mm (USNM 1607374 = ULLZ 17894) northwestern Gulf of Mexico shelf, off Texas.

Figure 1. Gilvossius setimanus s.s., adapted from Williams (1984Williams, A.B. 1984. Shrimps, lobsters, and crabs of the Atlantic coast of the eastern United States, Maine to Florida. Washington, D.C., Smithsonian Institution Press, 550p.: fig. 1 2 5a-d), male, USNM 14096 (A, C, E, F) and from **Rabalais et al. (1981**Rabalais, N.N.; Holt, S.A. and Flint, R.W. 1981. Mud shrimps (Crustacea, Decapoda, Thalassinidea) of the northwestern Gulf of Mexico. Bulletin of Marine Science, 31: 96-115.: fig. 2b, c) female, USNM 51007 (B, D). A, anterior carapace, eyes, antennules, and antennae, dorsal surfaces; B, third maxilliped, internal surface; C, D, major cheliped, external surface; E, minor cheliped, external surface; F, sixth pleonal somite, telson, and left uropods, dorsal surfaces. Not shown to scale.

Figure 2. Gilvossius howellorum n. sp., male holotype, pocl 12.4 mm, lower Tampa Bay, St. Petersburg, Florida, shallow subtidal flat (USNM 1546234 = ULLZ 12183): A, B, anterior carapace, eyes, and peduncles, lateral and dorsal; C, right mandible, internal; D, right first maxilla, external; E, right second maxilla, external; F, right first maxilliped, external; G, right second maxilliped, internal; H, right third maxilliped without setae, external; I, right third maxilliped, internal. Scale bars = 3.0 mm (A, B, D-I), 1.5 mm (C).

Figure 3. Gilvossius howellorum n. sp. A, E, J-L, ovigerous female paratype, pocl 11.5 mm, lower Tampa Bay, St. Petersburg, Florida, shallow subtidal flat (USNM 1540396 = ULLZ 4500TB-A); B-D, F-I, M, male holotype, pocl 12.4 mm, lower Tampa Bay, St. Petersburg, Florida, shallow subtidal flat (USNM 1546234 = ULLZ 12183). A, female major cheliped, external; B, male major chela, external; C, minor cheliped; D, right second pereopod, external; E, left third pereopod, internal; F, right third pereopod, external; G, left fourth pereopod, internal; H, right fifth pereopod, external; I, right fifth pereopod terminus, internal; J, female right first pleopod, external; K, female right second pleopod, external; L, right third pleopod, anterior; M, telson and uropods, dorsal, right uropodal setation shown. Scale bars = 3.0 mm (A-H, J-M), 1.5 mm (I).

Figure 4. Gilvossius fredericqae n. sp., female holotype, pocl 4.0 mm, northwestern Gulf of Mexico, off Texas, 98 m depth (USNM 1607374 = ULLZ 17894): A, B anterior carapace, eyes, and peduncles, lateral and dorsal; C, right mandible, internal; D, right first maxilla, external; E, right second maxilla without setae, external; F, right first maxilliped without setae, external; G, right second maxilliped, external; H, I, right third maxilliped, internal and external. Scale bars = 1.0 mm (A, B, E-G), 0.5 mm (C, D).

Figure 5. Gilvossius fredericqae n. sp. A, B, E-G, K, L, N, O, female holotype, pocl 4.0 mm, northwestern Gulf of Mexico, off Texas, 98 m depth (USNM 1607374 = ULLZ 17894); C, H-J, ovigerous female paratype, pocl 3.6 mm, northwestern Gulf of Mexico, off Texas, 131 m depth (USNM 1607376 = ULLZ 17903); D, juvenile male paratype, pocl 2.2 mm, northwestern Gulf of Mexico, off Texas, 125 m depth (USNM 1607379 = ULLZ 17906); M, male paratype, pocl 2.7 mm, northwestern Gulf of Mexico, off Texas, 106 m depth (USNM 1607375 = ULLZ 17495). A, major cheliped of female, right, internal; B, same, external; C, major cheliped of ovigerous female, left internal; D, major cheliped of juvenile male, internal; E, minor cheliped of female, left, external; F, second pereopod, left, external; G, third pereopod, right, external; H, fourth pereopod, right, internal; I, same, without setae, external; J, fifth pereopod, right, external; K, first pleopod, female, right, external; L, second pleopod, female, right, external; M, first pleopod, male, right, external; N, third pleopod, right, anterior; O, telson and uropods. Scale bars = 2.0 mm (A-C, E, F-J, O), 1.0 mm (D, K, M, N).

Figure 6. Gilvossius setimanus s.s. (A-C), Gilvossius howellorum n. sp. (D-F), Gilvossius fredericqae n. sp. (G). A, male, preserved major cheliped, external above, internal below, prpdl 16.1 mm (USNM 9238), Massachusetts; B, female, preserved major cheliped, external above, internal below, prpdl 16.1 mm (USNM 9238), Massachusetts; C, male, preserved major cheliped, external above, internal below, prpdl 18.6 mm, pocl 15.5 mm (USNM 20869), Rhode Island; D, E, male holotype, pre-preservation specimen in lateral views, pocl 12.4 mm (USNM 1546234 = ULLZ 12183) Tampa Bay, western Florida; F, male paratype, preserved major cheliped, external, prpdl 15.0 mm (USNM uncataloged) Anna Maria Island Causeway, western Florida; G, female holotype, preserved specimen in lateral view, pocl 4.0 mm (USNM 1607374 = ULLZ 17894) northwestern Gulf of Mexico shelf, off Texas.

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Two new burrowing mud shrimps of the genus <i>Gilvossius</i> from the Gulf of Mexico (Crustacea: Decapoda: Callianassidae)

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[1] Corresponding author:
Rafael Robles roblesrafaelr@gmail.com