Axianassa canalis Kensley & Heard , 1990

Anker, Arthur & Pachelle, Paulo P. G., 2016, Mud-shrimps of the genus Axianassa Schmitt, 1924 from Panama, with description of two new species (Decapoda: Gebiidea: Laomediidae), Zootaxa 4111 (2), pp. 101-125: 104-105

publication ID

http://doi.org/10.11646/zootaxa.4111.2.1

publication LSID

lsid:zoobank.org:pub:0208587B-598C-4202-A4BA-8FDECD2C93B9

persistent identifier

http://treatment.plazi.org/id/895FDE15-FF0D-9E7A-FF5A-F994FB40D2A9

treatment provided by

Plazi

scientific name

Axianassa canalis Kensley & Heard , 1990
status

 

Axianassa canalis Kensley & Heard, 1990  

( Fig. 3–5 View FIGURE 3 View FIGURE 4 View FIGURE 5 )

Axianassa canalis Kensley & Heard 1990   : 567, fig. 7.

Material examined. 1 male (cl 7.1 mm), MZUSP 34079, Pacific coast of Panama, Azuero   Peninsula, Playa El Agallito, intertidal sand-mud flat, in burrow with pinnotherid crab and alpheid shrimp ( Leptalpheus   sp.), coll. A. Anker, J.F. Lazarus, T. Kaji, 22.iii. 2015; 1 male (cl 9.4 mm), MZUSP 34080, Pacific coast of Panama, El Agallito, intertidal, sand-mud flat, in burrow with pinnotherid crab, coll. A. Anker, J.F. Lazarus, T. Kaji, 22.iii. 2015; 5 males (cl 5.1–13.5 mm), 5 females (cl 7.2–12.5 mm), MZUSP 34085, Pacific coast of Panama, Playa El Agallito, intertidal sand-mud flat, in burrows, coll. A. Anker, J.F. Lazarus, T. Kaji, 22.iii. 2015; 1 male (cl 7.1 mm), UP, same collection data as for previous specimens; 1 male (cl 5.5 mm), MZUSP 34092, Pacific coast of Panama, Las Perlas Archipelago, Isla Casayeta, large bay with mud flat fringed by rocks and mangroves, 0.3 m, in burrows, coll. A. Anker, 20.iv. 2015.

Description. See Kensley & Heard (1990); additional illustrations and colour photographs are provided in Figs. 3–5 View FIGURE 3 View FIGURE 4 View FIGURE 5 .

Colouration. Creamy whitish, with faint straw or pale yellow tinge; inner organs yellowish ( Fig. 5 View FIGURE 5 ).

Distribution. Eastern Pacific: currently known only from Panama ( Panama Canal, Azuero   Peninsula, Las Perlas Archipelago) ( Kensley & Heard 1990; present study).

Ecology. Lower intertidal and shallow subtidal (present material: less than 0.5 m) mud flats, often near mangroves; in burrows in mud or muddy sand; sometimes with commensal pea crabs (D.L. Felder, in study) and/or alpheid shrimps, Leptalpheus   sp. (A. Anker, in study).

Remarks. Axianassa canalis   was previously known based on an incomplete male holotype specimen, missing both chelipeds, collected “from dredge flume” at the Pacific entrance of the Panama Canal ( Kensley & Heard 1990). The present material of A. canalis   consists of a dozen mostly complete and adult specimens of both sexes collected near Playa El Agallito, on the eastern coast of the Azuero   Peninsula, and one relatively young individual collected in a muddy bay of Isla Casayeta, Las Perlas Archipelago. The previously unknown major and minor chelipeds ( Fig. 4 View FIGURE 4 ) are characterised by the presence of three or four strong teeth on the ventrolateral margin of the ischium and one very stout sharp tooth on the ventromesial margin of the merus, at about mid-length of this article. The cheliped carpus is smooth and unarmed ventrally, whereas the ventral margin of the palm is rugose, more so on the major chela ( Fig. 4 View FIGURE 4 A, C). In both the major and the minor chelipeds, the distomesial and distolateral margins of the palm are armed with several strong teeth adjacent to the articulation with the dactylus ( Fig. 4 View FIGURE 4 ). The cutting edges of the major cheliped fingers are armed with very stout teeth proximally and smaller serrations more distally; the dactylus may also have a large hiatus in proximal half or near mid-length ( Fig. 4 View FIGURE 4 A, B). The cutting edge of the minor cheliped pollex is armed with two or three large sharp teeth in addition to serrations; the dactylus has serrations only ( Fig. 4 View FIGURE 4 C, D). The distolateral margin of the uropodal exopod usually bears one distolateral tooth ( Fig. 3 View FIGURE 3 D), rarely two teeth. The first pleuron is ventrally armed with a strong process in both sexes. The most important diagnostic character of A. canalis   is the presence of a dense field of thick fusiform setae on the ventral margin of the third maxilliped ischium ( Fig. 3 View FIGURE 3 B; see also Kensley & Heard 1990: fig. 7 D).

MZUSP

Museu de Zoologia da Universidade de Sao Paulo

Kingdom

Animalia

Phylum

Arthropoda

Class

Malacostraca

Order

Decapoda

Family

Laomediidae

Genus

Axianassa

Loc

Axianassa canalis Kensley & Heard , 1990

Anker, Arthur & Pachelle, Paulo P. G. 2016
2016
Loc

Axianassa canalis

Kensley 1990: 567
1990