Automate cf. rectifrons Chace, 1972

Soledade, Guidomar O., Fonseca, Mytalle S. & Almeida, Alexandre O., 2015, Shallow-water stenopodidean and caridean shrimps from Abrolhos Archipelago, Brazil: new records and updated checklist, Zootaxa 3905 (1) : -

publication ID

https://doi.org/ 10.11646/zootaxa.3905.1.3

publication LSID

lsid:zoobank.org:pub:E7DEECAF-96C5-48E1-8396-3B7063ECA841

DOI

https://doi.org/10.5281/zenodo.6101106

persistent identifier

https://treatment.plazi.org/id/03DA87D2-9714-EE50-FF56-338EFDAE6F94

treatment provided by

Plazi

scientific name

Automate cf. rectifrons Chace, 1972
status

 

Automate cf. rectifrons Chace, 1972 View in CoL

( Fig. 3 View FIGURE 3 F, 4)

Material examined. 1 n-ov, 02.ix.2013, Ilha de Santa Bárbara (17°57’49”S 38°41’53”W), coll. G.O. Soledade, intertidal, under rocks, UESC 1558.

Distribution. Western Atlantic—Mexico (Quintana Roo), possibly Antigua; Brazil (Bahia and São Paulo?) ( Chace 1972; Pires-Vanin et al. 1997; Anker & Komai 2004; this study).

Previous records from Abrolhos. None.

Remarks. Automate rectifrons was previously known with certainty only from the type locality, Quintana Roo, Mexico. Pires-Vanin et al. (1997) recorded this species from São Sebastião Channel, São Paulo, however, in a species list, i.e. without any morphological account; therefore, the record from São Paulo requires confirmation. The present specimen from the Abrolhos ( Fig. 4 View FIGURE 4 A, B) is the first confirmed record of A. rectifrons in Brazil and the South Atlantic. Based on its morphological features (e.g., third and fourth pereiopods without stout spiniform setae; stylocerite not exceeding first article of the antennular peduncle), A. rectifrons belongs to the A. evermanni Rathbun, 1901 species group (see Anker & Komai 2004). The Abrolhos specimen differs from the holotype specimen of A. rectifrons (cf. Chace, 1972) in several characteristics. In the Abrolhos specimen, the major cheliped fingers are curved and have a broad gap and sharp teeth on the cutting edges (two on the dactylus and four on the pollex). In the holotype of A. rectifrons , the fingers are not curved, the gap between them is rather narrow, and the cutting edge of the pollex bears only one proximal tooth (cf. Chace 1972). Other divergent characters are the shape of the major cheliped merus (irregular and armed with a sharp tooth on the mesial margin ( Fig. 4 View FIGURE 4 C) vs. semirectangular and unarmed on the mesial margin in Chace’s material) and the uropods (with endopod only slightly overreaching exopod ( Fig. 4 View FIGURE 4 F) vs. strongly overreaching exopod in Chace’s material). It is noteworthy that the Abrolhos is similar in size to the holotype, at cl 3.0 mm and cl 3.5 mm, respectively. Thus, the above-noted differences between the Abrolhos specimen and the holotype may be of some taxonomic significance. However, more material needs to be collected in the Caribbean Sea and in Brazil to draw more definitive conclusion on the status of the Brazilian populations.

Kingdom

Animalia

Phylum

Arthropoda

Class

Malacostraca

Order

Decapoda

Family

Alpheidae

Genus

Automate

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