Gephyromantis striatus (Vences, Glaw, Andreone, Jesu and Schimmenti, 2002)

Vences, Miguel, Koehler, Joern, Crottini, Angelica, Hofreiter, Michael, Hutter, Carl R., du Preez, Louis, Preick, Michaela, Rakotoarison, Andolalao, Rancilhac, Lois, Raselimanana, Achille P., Rosa, Goncalo M., Scherz, Mark D. & Glaw, Frank, 2022, An integrative taxonomic revision and redefinition of Gephyromantis (Laurentomantis) malagasius based on archival DNA analysis reveals four new mantellid frog species from Madagascar, Vertebrate Zoology 72, pp. 271-309 : 271

Gephyromantis striatus (Vences, Glaw, Andreone, Jesu and Schimmenti, 2002)

Mantidactylus striatus Vences, Glaw, Andreone, Jesu and Schimmenti, 2002: 203

Note.

This species was described from lower elevations of the Marojejy Massif, and specimens from Tsararano and Masoala were assigned to the species based on morphology ( Vences et al. 2002). We provide the first molecular data for specimens collected at two sites on the Masoala Peninsula, confirming that these populations are conspecific with those from Marojejy (Fig. 1 ). G. striatus is defined by its rather weakly tubercular dorsum and an incomplete (posterior) light vertebral stripe (Fig. 9 ). A tibial gland is absent. Based on morphometric data in Vences et al. (2002), SVL ranges from 22.2-23.8 mm in males and 23.9-26.9 mm in females.

Call.

The advertisement call was recorded on 22 February 1995 at Marojejy National Park (air temperature 25.0°C; Vences et al. 2006: CD2, track 29). It consists of a moderately long multinote call of variable duration, usually emitted in series at rather regular intervals (Fig. 10 ). Slight amplitude modulation is recognizable within calls, with notes at the beginning and the end of the call having lower energy. Notes are very short and appear to consist of two pulses, which are largely fused. They are usually repeated at regular intervals within calls, but might be spaced more narrowly at the beginning and end of a call. Frequency modulation is absent. Numerical call parameters of 23 analyzed calls emitted by 2 individuals are as follows (range followed by mean ± standard deviation in parentheses): call duration 439-1360 ms (848.5 ± 319.1 ms); note duration 3-7 ms (5.1 ± 0.8 ms); number of notes per call 17-45 (29.8 ± 8.4); note repetition rate within calls 25.6-33.5 notes/second (31.1 ± 3.2 notes/second); call repetition rate within call series approximately 22-27 calls/minute; dominant frequency 3768-4153 Hz (3983 ± 161 Hz); prevalent bandwidth 2300-5200 Hz.

Figures

Figure 1. Maximum Likelihood phylogenetic tree inferred from an alignment of 508 nucleotides of the mitochondrial 16 S rRNA gene, in 88 individuals of Gephyromantis belonging to the subgenus Gephyromantis Laurentomantis. A species of the subgenus Gephyromantis Vatomantis (G. webbi) was used as the outgroup. Numbers at nodes are bootstrap values in percent (500 replicates; not shown if <50 %). Colors correspond to main species-level lineages as discussed in the text.

Figure 9. Adult male of Gephyromantis striatus from Marojejy National Park in life: A dorsolateral and B ventral view; photographed in 1994 (individual not reliably attributable to a voucher specimen). Not to scale.

Figure 10. Audiospectrogram and corresponding oscillogram of one advertisement call of Gephyromantis striatus recorded on 22 February 1995 at Marojejy National Park. Recording band-pass filtered at 1500 - 7500 Hz.