Meningodora compsa ( Chace, 1940 )

Alves-Júnior, Flavio De Almeida, Silva, Elinai Dos Santos, Araújo, Marina De Sá Leitão Câmara De, Cardoso, Irene, Bertrand, Arnaud & Souza-Filho, Jesser F., 2019, Taxonomy of deep-sea shrimps of the Superfamily Oplophoroidea Dana 1852 (Decapoda: Caridea) from Southwestern Atlantic, Zootaxa 4613 (3), pp. 401-442 : 416-418

Meningodora compsa ( Chace, 1940)

( Figs. 17 A–B, 18 , 40 B)

Notostomus compsus Chace, 1940:156 , Figs 31 , 32a– i. Meningodora compsa — Crosnier & Forest 1973: 48, fig. 10e.— Kikuchi 1985:196 (key).— Chace 1986: 49 (key).— Kikuchi 1991: 25, fig. 2.

Material examined: 1 OF, off Pernambuco, Abracos 2, ST#16, Leg.1, Midwater Tow, 680 m, 07° 36,25’ S / 033° 99,17 ‘ W, 14 April 2017, MOUFPE: 18.354.

Diagnosis: Carapace dorsally sharply carinate for nearly its entire length. Rostrum with 5–6 dorsal teeth; 2–3 of them behind the anterior portion of orbit; rostrum without spine on ventral margin. Rostrum reaching beyond the antennular peduncles. Branchiostegal spine supported by a short carina. First somite of abdomen rounded dorsally; second somite with a very faint carina; third somite unarmed; fourth, fifth and sixth somites with a median posterior spine, sixth somite 2.2x longer than fifth. Telson shorter than uropods, deeply sulcate dorsally, with 4–5 pairs of dorsolateral spines.

Distribution: Western Atlantic: Bermuda. Southwestern Atlantic Brazil: (Pernambuco). Eastern Atlantic: Northern mid-Atlantic Ridge, Portugal (Azores Island), Senegal ( Chace 1940; Crosnier & Forest 1973) ( Fig. 18 ).

Bathymetric distribution: 874–1829 m depth ( Chace 1940; Crosnier & Forest 1973), herein this species was found in Brazilian waters at depth of 680 m, thus extending its bathymetric distribution from shallower waters.

Remarks: The specimens analyzed herein do not differ from the descriptions of Chace (1940) and Crosnier & Forest (1973). According to Chace (1940) M. compsa might easily be confused with species of M. vesca ( Smith, 1886) , but can be distinguished by some differences as: in M. compsa , the total length of individuals vary between 11–16 cm; rostrum presents 4–5 dorsal teeth, ventral tooth absent; branchiostegal spine with a sharp ridge ( Fig. 17B ) and sixth abdominal somite little longer than fifth, while in M. vesca the total sizes vary between 2–6 cm; rostrum presents 6–12 dorsal teeth and 1–2 ventral teeth; branchiostegal spine with reduced ridge (see Fig. 23 ) and sixth abdominal somite almost twice longer than fifth. This species is known only from the Atlantic Ocean and it is rarely recorded above 500 m depth (bathypelagic distribution). The genus Meningodora currently comprises six species, with worldwide distribution in mesopelagic zones. Thus, this paper reports for the first time the occurrence of M. compsa from Southwestern Atlantic (Brazilian waters).

Figures

FIGURE 17. Meningodora compsa (Chace, 1940). A. Ovigerous Female, lateral view. B. Telson, dorsal view (MOUFPE: 18.354). Scale bar = 1 cm.

FIGURE 18. Geographic distribution of Meningodora compsa (Chace, 1940) in the Atlantic Ocean. Black circles = previous records; star = new record.

FIGURE 23. Meningodora vesca (Smith, 1886). A. Male, lateral view. B. Abdomen, with somites 1–6 in dorsal view (MOUF- PE: 18.413). Scale bar = 1 mm.

FIGURE 31. Oplophorus gracilirostris A. Milne-Edwards, 1881. A. Female, lateral view. B. Telson, dorsal view (MOUFPE: 15.673). Scale bar = 0.5 cm.

FIGURE 40. Deep-sea shrimps of the families Acanthephyridae Spence Bate, 1888 and Oplophoridae Dana, 1852 being: A. Ephyrina ombango Crosnier & Forest, 1973 (MOUFPE: 18.399). B. Meningodora compsa (Chace, 1940) (MOUFPE: 18.354). C. Notostomus elegans A. Milne-Edwards, 1881 (MOUFPE: 18.401). D. Notostomus gibbosus A. Milne-Edwards, 1881 (MOUFPE: 18.447). E. Janicella spinicauda (A. Milne-Edwards, 1883) (MOUFPE: 15.661). F. Oplophorus gracilirostris A. Milne-Edwards, 1881 (MOUFPE: 15.673), with material collected in Northwestern Brazil.