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PHYLOGENY/TAXONOMY

 









 
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Ammotrecha
cobinensis Muma 1951
Ammotrecha cobinensis Muma, 1951:
135, figs 302-304; Muma, 1970b: 49; Muma, 1976: 26; Muma, 1987: 21; Vázquez
Rojas, 1995: 31; Vázquez Rojas, 1996e: 76; Brookhart and Brookhart, 2006:
323.
HOLOTYPE:
United
States. California: Los
Angeles County. - Covina, 30 December 1927 (J.C. Chamberlin), 1 males
(holotype). Deposited in the University of Utah. [Note:
Muma (1951) lists the type locality as "Cobina, California". No such
community exists within California. The locality is therefore presumed
(Harvey 2001) to be Covina, California, a city within Los Angeles County.]
Original
description:
Muma, 1951: 135, figs 302-304:
"MALE
HOLOTYPE: Total length, 9.0 mm. Chelicerae, 0.7 mm. wide and 2.6 mm.
long. Propeltidium, 1.9 mm. wide and 1.7 mm. long. Chelicerae,
0.7 mm. wide and 2.6 mm. long. Propeltidium, 1.9 mm. wide and 1.7 mm.
long.
Coloration and markings in alcohol bleached and faded but
apparently as follows: chelicerae light yellow; propeltidium light
brown, with a narrow yellow median stripe; mesopeltidium, metapeltidium
and abdominal tergites light, with a dusky purple median stripe and a
pair of dusky submarginal stripes; legs apparently light on all
segments; palpi apparently light except on metatarsi and tarsi where
some duskiness is visible; eye tubercle dark; malleoli light.
Dentition typical of Ammotrechinae as shown in figures 302 and
303. Fixed finger not modified and lacking carina. Intermediate tooth
of movable finger about equidistant between principal and anterior
teeth. Dental group of movable finger occupying about one-fourth the
length of the finger. Flagellum as in A. peninsulana (Banks)
except it is attached over the first fondal tooth of the mesal row and
is not rolled mesally so far, covering less than one-fourth of the mesal
surface.
Palpi clothed with long and short hairs and a moderate number
of cylinder bristles on the tarsi, metatarsi, and tibiae. Metatarsi and
tibiae also provided ventrally with eight pairs of stout cylindrical
spines.
Chelicerae nearly four times as long as wide. Propeltidium
wider than long by a ratio of 1 to 1.1. Eyes separated by slightly less
than one diameter."
[Illustration forthcoming]
DISTRIBUTION: United States
(California). Known only from
holotype.
NOTES: Muma (1951) noted that
the holotype is missing all but one first and one third leg, a condition
which he considered as preventing its generic placement. He thus chose to
describe it "under the genus Ammotrecha, sensu lato."
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