Laleonectes vocans (A. Milne-Edwards 1878)
- Dataset
- Brachyuran crabs (Crustacea, Decapoda) from the remote oceanic Archipelago Trindade and Martin Vaz, South Atlantic Ocean
- Rank
- SPECIES
Classification
- kingdom
- Animalia
- phylum
- Arthropoda
- class
- Malacostraca
- order
- Decapoda
- family
- Portunidae
- genus
- Laleonectes
- species
- Laleonectes vocans
biology_ecology
Ecological notes. Laleonectes vocans (Fig. 28 A – D) has been reported from a variety of bottoms including calcareous sand, coral, coral rubble, calcareous algae and seagrass flats, between 6 and 310 m (Grajal & Laughlin 1984; Coelho & Ramos-Porto 1992; Melo 1996). It is the most common swimming crab in Trindade where it has been found in calcareous sand with shell and algal fragments; calcareous sand; sand and rocks; calcareous algae and sand bottoms. It is preyed on by the grouper Cephalopholis cruentata (Lacepède) (Murillo-Pérez et al. 2021).
description
(Fig. 28 A – D)
description
Size of largest male: cl 7.2 mm, cw 14.9 mm; female: cl 10.2 mm, cw 20 mm.
discussion
Remarks. The species in Laleonectes can be easily recognized by having a stridulating ridge (Manning & Chace 1990) stretching along the lateral walls of the carapace, across the pterygostomial region into the infraorbital margin (Fig. 28 B).
distribution
Distribution. Amphi-Atlantic. Western Atlantic: Gulf of Mexico, Antilles, Venezuela and Brazil (Espírito Santo and Rio de Janeiro) (Grajal & Laughlin 1984; Coelho & Ramos-Porto 1992; Melo 1996; Felder et al. 2009; Diez García 2014). Brazilian oceanic islands: Trindade (Serejo et al. 2006; Tavares et al. 2017); seamounts (this study): Almirante Saldanha, Besnard, Davis, Dogaressa, Jaseur, Montague and Vitória banks. It is also known from the Pleistocene of Coral Rock, Barbados (Collins & Morris 1976) and upper Pleistocene of Port Morant Formation, Jamaica (Donovan 2010). Central Atlantic: Ascension Island (Rathbun 1930; Manning & Chace 1990; De Grave et al. 2017). Eastern Atlantic: Madeira, Canary Islands; Cape Verde, São Tomé and Annobon (Monod 1956; Manning & Chace 1990; González 2016).
materials_examined
Comparative material examined. Laleonectes vocans: Cuba: 1 female (USNM 19867), off Havana, R / V “ Albatross ”, stn 2330, 23 ° 10 ’ 48 ” N, 82 ° 19 ’ 15 ” W, 17. i. 1885, 221 m. Central Atlantic: 1 female (USNM 190729), Ascension Island, Long Beach, R. B. Manning coll., 23. i. 1977. Brazil: Espírito Santo: 1 female, 2 juveniles (MZUSP 41459), Vitória – Trindade Seamount Chain, R / V “ Marion Dufresne ”, TAAF MD 55 / Brésil Expedition, Dogaressa Bank, stn 24 DC 42, 20 ° 54.67 ’ S, 34 ° 01.35 ’ W, 17. v. 1987, 60 m. 1 male, 1 juvenile female (MZUSP 41473), ibidem, Dogaressa Bank, stn 25 DC 43, 20 ° 51 ’ S, 33 ° 45 ’ W, 17. v. 1987, 63 m. 1 male, 1 juvenile (MZUSP 21202), ibidem, Montague Bank, stn 14 DC 27, 20 ° 25 ’ S, 36 ° 42 ’ W, 14. v. 1987, 81 m. 1 male (MZUSP 41462), H / V “ Antares ”, REVIZEE / Central Expedition, Montague Bank, stn 24 C, 20 ° 21 ’ 03 ” S, 36 ° 38 ’ 14 ” W, 7. xi. 1997, 62 m. 1 juvenile (MZUSP 21203), Vitória – Trindade Seamount Chain, R / V “ Marion Dufresne ”, TAAF MD 55 / Brésil Expedition, Vitória Bank, stn 13 DC 26, 20 ° 21 ’ S, 36 ° 59 ’ W, 14. v. 1987, calcareous sand with shell and algal fragments, 97.5 m. 1 juvenile female (MZUSP 41475), ibidem, Vitória Bank, stn 9 DC 22, 20 ° 32.39 ’ S, 38 ° 10.49 ’ W, 13. v. 1987, 52 m. 1 male (MZUSP 21205), ibidem, stn 10 DC 24, 20 ° 41 ’ S, 37 ° 49 ’ W, 13. v. 1987, 48 m. 1 female, 2 juveniles (MZUSP 41461), ibidem, Davis Bank, stn 23 DC 41, 20 ° 38.50 ’ S, 34 ° 42.93 ’ W, 17. v. 1987, sand and rocks, 58 – 70 m. 1 juvenile (MZUSP 41465), ibidem, Davis Bank, stn 23 DC 40, 20 ° 39 ’ S, 34 ° 41 ’ W, 15. v. 1987, sandy shell, 60 m. 1 juvenile (MZUSP 41467), ibidem, Jaseur Bank, stn 21 DC 35, 20 ° 42 ’ S, 35 ° 22 ’ W, 16. v. 1987, calcareous sand, 82 m. 2 juveniles (MZUSP 41471), ibidem, Jaseur Bank, stn 20 DC 34, 20 ° 28 ’ S, 35 ° 54 ’ W, 15. v. 1987, 54 m. 1 female (MZUSP 41474), ibidem, Jaseur Bank, stn 17 DC 30, 20 ° 26.72 ’ S, 36 ° 17.30 ’ W, 15. v. 1987, calcareous algae and sand, 60 m. 1 male, 1 female (MZUSP 41468), H / V “ Antares ”, REVIZEE / Central Expedition, Besnard Bank, stn D 41, 19 ° 41 ’ S, 38 ° 14 ’ W, 29. ii. 1996, 69 m. Rio de Janeiro: 1 juvenile female (MZUSP 41460), H / V “ Antares ”, REVIZEE / Central Expedition, “ Almirante Saldanha ” Bank, stn 7 BT 36, 22 ° 31 ’ S, 37 ° 35 ’ W, M. Tavares coll., 8. ii. 1996, 105 m.
materials_examined
Trindade specimens. 1 male (MZUSP 40172), Brazil, off Espírito Santo, Trindade Island, Enseada dos Portugueses, SECON, 20 ° 30 ’ 20.9 ” S, 29 ° 18 ’ 43.7 ” W, J. B. Mendonça coll., 29. iv. 2014, 0.9 m. 1 male (MZUSP 40174), ibidem, Enseada dos Portugueses, 20 ° 30 ’ 17.7 ” S, 29 ° 18 ’ 56.7 ” W, J. B. Mendonça coll., 18. iv. 2014, 10.2 m. 1 male (MZUSP 40179), ibidem, Ponta da Calheta, 20 ° 30 ’ 16.59 ” S, 29 ° 18 ’ 30.11 ” W, J. B. Mendonça coll., 30. i. 2019, 15.1 m. 1 male (MZUSP 39659), ibidem, 20 ° 30 ’ 18.72 ” S, 29 ° 18 ’ 31.6 ” W, J. B. Mendonça coll., 25. vii. 2018, 15.6 m. 1 juvenile (MZUSP 41418), ibidem, J. B. Mendonça coll., 20. vii. 2014, 16.3 m. 1 juvenile (MZUSP 41469), R / V “ Marion Dufresne ”, TAAF MD 55 / Brésil Expedition, Ponta da Calheta, stn 35 DC 59, 20 ° 30.37 ’ S, 29 ° 18.55 ’ W, 22. v. 1987, 60 m. 1 male (MZUSP 33836), ibidem, Ilha da Racha, 20 ° 30 ’ 26.5 ” S, 29 ° 20 ’ 48 ” W, J. B. Mendonça coll., 3. vi. 2015, 23 m. 1 juvenile (MZUSP 39620), ibidem, 30. vii. 2018, 24.8 m. 1 juvenile female (MZUSP 40175), Enseada dos Portugueses, SECON, 20 ° 30 ’ 20.9 ’ S, 29 ° 18 ’ 43.7 ” W, J. B. Mendonça coll., 29. iv. 2014, 9.9 m. 1 juvenile female (MZUSP 40980), ibidem, SECOM / ECIT, J. B. Mendonça coll., 14. v. 2014, 10 m. 1 female (MZUSP 40170), ibidem, Enseada das Orelhas, 20 ° 29 ’ 40.2 ” S, 29 ° 20 ’ 32.9 ” W, J. B. Mendonça coll. 21. vii. 2015, 15 m. 1 female (MZUSP 40180), ibidem, Ponta Norte, 20 ° 29 ’ 18.7 ” S, 29 ° 20 ’ 18.3 ” W, J. B. Mendonça coll., 23. vi. 2016, 11.3 m. 1 juvenile male (MZUSP 40171), ibidem, Praia das Cabritas, 20 ° 29 ’ 41.38 ” S, 29 ° 19 ’ 39.99 ” W, J. B. Mendonça coll., 25. vi. 2015, 12 m. 1 juvenile (MZUSP 41463), R / V “ Marion Dufresne ”, TAAF MD 55 / Brésil Expedition, off Trindade Island, stn 36 DC 61, 20 ° 29 ’ S, 29 ° 18 ’ W, 22. v. 1987, 63 m.