Maevia intermedia

Barnes, 1955

Maevia intermedia is a jumping spider ( Salticidae) native to North America, described by Robert D. Barnes in 1955 to distinguish it from similar congeneric . It is morphologically intermediate between Maevia inclemens and Maevia expansa, with males resembling the light morph of M. inclemens. The species is medium-sized, with females slightly larger than males, and possesses the characteristic Salticid visual system with forward-facing principal .

Pronunciation

How to pronounce Maevia intermedia: /ˈmaɪviə ˌɪntərˈmiːdiə/

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Identification

Distinguished from Maevia inclemens by male reproductive structures: palps of males are larger with cymbium rotated so width equals length. Females distinguished by V-shaped opening (pit-shaped). Extremely similar to M. inclemens in general appearance; males most similar to light morph of that . Distinguished from M. expansa by intermediate .

Appearance

Medium-sized jumping spider, 5–6.5 mm in length. Females slightly larger than males. Body covered in small hairs and spines along the . Males identical in color and to the light morph of Maevia inclemens; females identical to females of M. inclemens with a V-shaped . Possesses eight in , lateral, and positions with forward-facing principal eyes providing high spatial acuity.

Habitat

Forests and man-made structures. Observed in pine flatlands and forested areas of the southeastern United States.

Distribution

Native to North America. Documented in southern United States including Georgia and Alabama. Distribution records indicate presence in USA.

Diet

Preys on insects. Hunting follows the typical Salticid pattern of stalking and pouncing on prey from a distance, facilitated by complex visual system.

Life Cycle

Undergoes direct development through instar stages via molting until maturity. Females use silk to encase fertilized in a cocoon. includes shedding of egg over 24–26 days, with first instar developing during this time. First occurs at similar period to egg membrane shedding. Juveniles leave cocoon a few days later and undergo series of to adulthood. In sister M. inclemens, morphs not distinguishable until final molt.

Behavior

Courtship expected to follow gray morph pattern of M. inclemens based on tendencies: male displays from approximately 3 cm distance by moving closer to surface and sliding in oscillatory motion while prone. Three-phase courtship: (1) male display for female attention and identification, (2) female recognition and receptivity signaling, (3) mounting and copulation followed by decoupling. Hunting involves orientation toward prey, pursuit/stalking, and capture via jumping with fangs extended. Jump generated by straightening of fourth leg pair via haemocoelic fluid pressure change.

Ecological Role

of insects in forest and human-modified environments. Part of understory and building-dwelling .

Human Relevance

May occasionally enter homes. Not considered medically significant. Subject of taxonomic study due to morphological similarity to congeneric .

Similar Taxa

Maevia inclemensExtremely similar ; M. intermedia males resemble light morph of M. inclemens, females are identical. Distinguished by male palp structure and female shape.
Maevia expansaM. intermedia described as intermediate form between M. inclemens and M. expansa; distinguished by intermediate .

More Details

Taxonomic history

Described by Robert D. Barnes in 1955 specifically to resolve confusion among similar-looking Maevia in the Americas.

Visual system

Principal forward-facing with complex layering similar to telescope structure, providing higher spatial acuity than other spiders and enabling sophisticated vision-dependent hunting strategies.