Alpheus christofferseni Anker, Hurt and Knowlton 2007
Creators: name: Bochini, Gabriel Lucas
name: Guéron, Rodrigo
name: Terossi, Mariana
name: Almeida, Alexandre Oliveira
Publisher: name: Zenodo
Year: 2023
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Malacostraca
Decapoda
Alpheidae
Alpheus
Alpheus christofferseni

description: Alpheus christofferseni Anker, Hurt and Knowlton, 2007
(Fig. 2)
Alpheus christofferseni Anker, Hurt and Knowlton, 2007: 3, figs. 1–6, 11a–c, 12b, c; De Grave and Fransen, 2011: 380; Soledade and Almeida, 2013: 97; De Grave and Anker, 2017: 4.
Material examined. Brazil, Pernambuco: 1 female (CL: 3.8mm), MOUFPE 20210, of Recife, associated with a biogenic substrate such as calcareous algae, dead coral, and sponges, depth: 51 m, 27.ii.2018, colls. G.L. Bochini, G.O. Soldade and R. Gueron; 1 male (CL: 3.3 mm), DZ/ UFRGS 6934 (genetic voucher, GenBank access ON746697), Praia dos Carneiros, Tamandaré, ARS, depth: 3–6 m, 20.viii.2019, colls. G.L. Bochini and G.O. Soledade.
Distribution. The species is found in the Western Atlantic: Panama (Bocas del Toro) and Brazil [Atol das Rocas and Pernambuco (off Recife and Tamandaré)] (Anker et al., 2007; this study).
Habitat. The species is mainly found in burrows on intertidal or shallow seagrass flats (0–1.5 m), associated with echiurans (Anker et al., 2007); reef areas (beach rock) 3–6 m; and substrate of biogenic origin such as calcareous algae, and dead coral, 51 m (this study).
Genetic data. The topology obtained (Fig. 1B) showed a clade formed by the two sequences of A. christofferseni and a clear separation of these from the other species. The intraspecific genetic distance of A. christofferseni was 0.9%, much smaller than the divergence of this species from other species of the brevirostris group (9.9% - 14.4%).
Remarks. The distribution range of A.christofferseni is extended by approximately five degrees south from the type locality (Atol das Rocas, ~3°51”S, Fig. 1A). The current southernmost record of the species is Praia dos Carneiros, Tamandaré, Pernambuco (~ 8°41’S). Furthermore, the bathymetric distribution increased significantly considering the collection of a specimen at 51 m depth. The specimens from Pernambuco (female and male) resemble the holotype. However, some morphological variations between the two specimens from Pernambuco and the holotype were observed, such as the exopod of the third maxilliped (Fig. 2B, C) reaches the penultimate segment of the endopod (vs. not reaching the penultimate segment of the third maxilliped in the holotype); telson (Fig. 2H, I) with mesial spiniform setae 4.5 times longer than the lateral spiniform setae (vs. mesial spiniform setae twice the size of the lateral spiniform setae in the holotype); third and fourth pereiopods (Fig. 2F, G) armed with four spiniform setae along the ventral margin and a pair of distal spiniform setae (vs. five spiniform setae and a pair of distal spiniform setae in the holotype).
description: Published as part of Bochini, Gabriel Lucas, Guéron, Rodrigo, Terossi, Mariana & Almeida, Alexandre Oliveira, 2023, Extension of the known range of the snapping shrimp Alpheus christofferseni Anker, Hurt and Knowlton, 2007 (Caridea: Alpheidae), pp. 1-7 in Nauplius (e 2023001) (e 2023001) 31 on page 4, DOI: 10.1590/2358-2936e2023001, http://zenodo.org/record/10716694